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| author | Scott McMurray <scottmcm@users.noreply.github.com> | 2024-03-29 00:00:24 -0700 |
|---|---|---|
| committer | Scott McMurray <scottmcm@users.noreply.github.com> | 2024-04-09 08:51:32 -0700 |
| commit | b5376ba6017fa04a13afda6ac52587f06a6c0bd8 (patch) | |
| tree | c75fa5017a7be5616695522ecfe57ee4cd1abd5d /tests/codegen/array-codegen.rs | |
| parent | ff24ef91fc848832a8dab483d3b17097cbead5a8 (diff) | |
| download | rust-b5376ba6017fa04a13afda6ac52587f06a6c0bd8.tar.gz rust-b5376ba6017fa04a13afda6ac52587f06a6c0bd8.zip | |
Remove my `scalar_copy_backend_type` optimization attempt
I added this back in 111999, but I no longer think it's a good idea - It had to get scaled back to only power-of-two things to not break a bunch of targets - LLVM seems to be getting better at memcpy removal anyway - Introducing vector instructions has seemed to sometimes (115515) make autovectorization worse So this removes it from the codegen crates entirely, and instead just tries to use <https://doc.rust-lang.org/nightly/nightly-rustc/rustc_codegen_ssa/traits/builder/trait.BuilderMethods.html#method.typed_place_copy> instead of direct `memcpy` so things will still use load/store for immediates.
Diffstat (limited to 'tests/codegen/array-codegen.rs')
| -rw-r--r-- | tests/codegen/array-codegen.rs | 44 |
1 files changed, 25 insertions, 19 deletions
diff --git a/tests/codegen/array-codegen.rs b/tests/codegen/array-codegen.rs index bb4bd5444db..1310e61c41d 100644 --- a/tests/codegen/array-codegen.rs +++ b/tests/codegen/array-codegen.rs @@ -5,52 +5,58 @@ // CHECK-LABEL: @array_load #[no_mangle] pub fn array_load(a: &[u8; 4]) -> [u8; 4] { - // CHECK: %_0 = alloca [4 x i8], align 1 - // CHECK: %[[TEMP1:.+]] = load <4 x i8>, ptr %a, align 1 - // CHECK: store <4 x i8> %[[TEMP1]], ptr %_0, align 1 - // CHECK: %[[TEMP2:.+]] = load i32, ptr %_0, align 1 - // CHECK: ret i32 %[[TEMP2]] + // CHECK-NOT: alloca + // CHECK: %[[ALLOCA:.+]] = alloca [4 x i8], align 1 + // CHECK-NOT: alloca + // CHECK: call void @llvm.memcpy.{{.+}}(ptr align 1 %[[ALLOCA]], ptr align 1 %a, {{.+}} 4, i1 false) + // CHECK: %[[TEMP:.+]] = load i32, ptr %[[ALLOCA]], align 1 + // CHECK: ret i32 %[[TEMP]] *a } // CHECK-LABEL: @array_store #[no_mangle] pub fn array_store(a: [u8; 4], p: &mut [u8; 4]) { + // CHECK-NOT: alloca + // CHECK: %[[TEMP:.+]] = alloca i32, [[TEMPALIGN:align [0-9]+]] + // CHECK-NOT: alloca // CHECK: %a = alloca [4 x i8] - // CHECK: %[[TEMP:.+]] = load <4 x i8>, ptr %a, align 1 - // CHECK-NEXT: store <4 x i8> %[[TEMP]], ptr %p, align 1 + // CHECK-NOT: alloca + // store i32 %0, ptr %[[TEMP]] + // CHECK: call void @llvm.memcpy.{{.+}}(ptr align 1 %a, ptr [[TEMPALIGN]] %[[TEMP]], {{.+}} 4, i1 false) + // CHECK: call void @llvm.memcpy.{{.+}}(ptr align 1 %p, ptr align 1 %a, {{.+}} 4, i1 false) *p = a; } // CHECK-LABEL: @array_copy #[no_mangle] pub fn array_copy(a: &[u8; 4], p: &mut [u8; 4]) { + // CHECK-NOT: alloca // CHECK: %[[LOCAL:.+]] = alloca [4 x i8], align 1 - // CHECK: %[[TEMP1:.+]] = load <4 x i8>, ptr %a, align 1 - // CHECK: store <4 x i8> %[[TEMP1]], ptr %[[LOCAL]], align 1 - // CHECK: %[[TEMP2:.+]] = load <4 x i8>, ptr %[[LOCAL]], align 1 - // CHECK: store <4 x i8> %[[TEMP2]], ptr %p, align 1 + // CHECK-NOT: alloca + // CHECK: call void @llvm.memcpy.{{.+}}(ptr align 1 %[[LOCAL]], ptr align 1 %a, {{.+}} 4, i1 false) + // CHECK: call void @llvm.memcpy.{{.+}}(ptr align 1 %p, ptr align 1 %[[LOCAL]], {{.+}} 4, i1 false) *p = *a; } // CHECK-LABEL: @array_copy_1_element #[no_mangle] pub fn array_copy_1_element(a: &[u8; 1], p: &mut [u8; 1]) { + // CHECK-NOT: alloca // CHECK: %[[LOCAL:.+]] = alloca [1 x i8], align 1 - // CHECK: %[[TEMP1:.+]] = load i8, ptr %a, align 1 - // CHECK: store i8 %[[TEMP1]], ptr %[[LOCAL]], align 1 - // CHECK: %[[TEMP2:.+]] = load i8, ptr %[[LOCAL]], align 1 - // CHECK: store i8 %[[TEMP2]], ptr %p, align 1 + // CHECK-NOT: alloca + // CHECK: call void @llvm.memcpy.{{.+}}(ptr align 1 %[[LOCAL]], ptr align 1 %a, {{.+}} 1, i1 false) + // CHECK: call void @llvm.memcpy.{{.+}}(ptr align 1 %p, ptr align 1 %[[LOCAL]], {{.+}} 1, i1 false) *p = *a; } // CHECK-LABEL: @array_copy_2_elements #[no_mangle] pub fn array_copy_2_elements(a: &[u8; 2], p: &mut [u8; 2]) { + // CHECK-NOT: alloca // CHECK: %[[LOCAL:.+]] = alloca [2 x i8], align 1 - // CHECK: %[[TEMP1:.+]] = load <2 x i8>, ptr %a, align 1 - // CHECK: store <2 x i8> %[[TEMP1]], ptr %[[LOCAL]], align 1 - // CHECK: %[[TEMP2:.+]] = load <2 x i8>, ptr %[[LOCAL]], align 1 - // CHECK: store <2 x i8> %[[TEMP2]], ptr %p, align 1 + // CHECK-NOT: alloca + // CHECK: call void @llvm.memcpy.{{.+}}(ptr align 1 %[[LOCAL]], ptr align 1 %a, {{.+}} 2, i1 false) + // CHECK: call void @llvm.memcpy.{{.+}}(ptr align 1 %p, ptr align 1 %[[LOCAL]], {{.+}} 2, i1 false) *p = *a; } |